Do the specification depend on grain size of sediments?
Need to trap sediments in order to determine the sedimentation rate/day in coastal area.
This paper may answer your question :
http://www.biol.canterbury.ac.nz/MERG/publications/pdfs/schiel,%20wood,%20dunmore,%20taylor%202006.pdf
According to my friends Sedimentologists, there are several types of traps exist in various forms, depending on what you want to measure exactly the type of site, the time that the trap will be left on the ground, etc..
In the case that concerns you, it is the objective of measuring sediment accretion or sedimentation rate?
sediment accretion can be achieved with the method of embedded plates. It is a small square pit that is dug into the sediment. Placed at the bottom of this pit a plastic plate of the same size hole plate before some holes for the water to percolate. We recorks hole. An oil is allowed before starting the measurements using a metal rod which is pushed into the sediment to touch the plate. There are tricks to find the plate.
Must perform several steps (9 in all, average + 95%) at different points of the plate. In this way you measure actual accretion or erosion sediment. This method works in almost all sediment types (except the finest water-saturated), including salt marshes (vegetation continues to grow without problem).
The method you describe seems to correspond to the measurement of sediment accretion in "real" time and is a palliative technique to the plates. The tubes used were generally measured 5cm in diameter and fifty cm.
the speed of sedimentation is measured in the laboratory and consists in measuring the speed at which the fine particles settle out in seawater
The sedimentation rate is measured in turn with the radioactive methods such as lead-210. Performing a sediment core layers and dates Pb-210. This allows to estimate the age of the layers and the sedimentation rate. This is not exactly the same.
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